Best Free Network Assessment Tools of 2025

Paessler PRTG is an all-inclusive monitoring solution with an intuitive, user-friendly interface powered by a cutting-edge monitoring engine. It optimizes connections and workloads, reduces operational costs, and prevents outages. It also saves time and controls service level agreements (SLAs). This solution includes specialized monitoring features such as flexible alerting, cluster failover, distributed monitoring, maps, dashboards, and in-depth reporting.

ManageEngine OpManager is a robust solution for network assessment that delivers comprehensive insights into the performance and well-being of network systems. It includes functionalities for identifying network devices, examining traffic trends, and pinpointing potential vulnerabilities within the infrastructure. With capabilities like performance benchmarking, capacity forecasting, and thorough reporting, OpManager empowers IT professionals to understand their network's strengths and weaknesses. This understanding allows organizations to make strategic choices regarding network enhancements, optimize resource distribution, and improve overall network efficiency and dependability.

Obkio is a simple Network Monitoring and Troubleshooting SaaS solution that allows users to continuously monitor the health of their network and core business applications to improve the end-user experience. Obkio identifies the cause of intermittent network problems, VoIP, video, and applications slowdown in seconds so you can troubleshoot before they affect your end-users. Deploy network monitoring Agents at strategic locations in a company's offices or network destinations such as data sites, remote sites, external client sites, or public or private clouds to continuously monitor performance using synthetic traffic exchanged every 500ms. Obkio continuously tests and measures network metrics, such as latency, jitter, packet loss, quality of service and customer experience via QoE (Quality of Experience). The app alerts you as soon as a problem occurs or even if there are signs that a failure is about to happen. Not only does it alert you and pinpoint the source of the issue, but it also allows you to go back in time to complete a diagnosis.

Empower your team to oversee and control the security, efficiency, and management of your complete IT infrastructure through a unified platform, all without any expense to you. The robust ITarian platform offers a streamlined approach to operations, enhances productivity, and optimizes the use of IT resources. Equip your IT personnel with enhanced monitoring and management functionalities. Increase IT efficiency by integrating roles, functions, and tools seamlessly. Ensure maximum uptime through proactive identification and resolution of issues. Streamline daily operations by automating routine tasks using custom scripts, thereby allowing your staff to focus on more strategic initiatives. This holistic approach not only improves workflows but also fosters innovation within your organization.

The Nmap initiative aims to challenge the perception that open-source software often lacks thorough documentation by offering an extensive array of guidance on how to install and utilize Nmap effectively. This webpage serves as a gateway to the official documentation from Insecure.Org, alongside valuable contributions from various sources. The book titled Nmap Network Scanning acts as the definitive resource for the Nmap Security Scanner, which is a free and open-source tool embraced by millions for purposes such as network discovery, management, and security assessments. It caters to a wide audience, from beginners learning the fundamentals of port scanning to seasoned hackers exploring advanced packet crafting techniques. With a 42-page reference section that meticulously outlines every feature and option available in Nmap, the remainder of the book illustrates how to leverage these tools to efficiently tackle practical challenges. Furthermore, it includes examples and diagrams that depict the actual data sent over the network, enhancing the reader's understanding of real-world applications. This comprehensive approach ensures that both novice users and expert professionals can find value in the material provided.

Network Analyzer gives administrators an in-depth view of all network traffic sources and possible security threats. This allows system administrators to quickly gather high-level information about the health of the network and highly granular data to complete and thorough network analysis. Network Analyzer gives you a central view of all your network traffic and bandwidth data, as well as potential network compromises. The home dashboard gives you an overview of important netflow and sflow data sources, server system metrics, abnormal network behavior, and other network issues. It is a quick way to assess the health of your network. Users can drill down to view specific information on IPs, source ports, destination ports, or any combination thereof. Network Analyzer's advanced alerting capabilities and reporting capabilities give IT staff a better understanding of their network. For further analysis and tracking, you can access and archive highly detailed and down-to-the packet data.

Quickly identify all of your assets and map your networks using rapid, secure scans that do not require credentials and operate from a single lightweight agent, eliminating the necessity for server installations. Reveal instances of policy violations, visualize IP allocations, pinpoint compliance issues, emphasize misconfigurations, and uncover security vulnerabilities. Utilize recurring scans to monitor asset alterations, detect newly added assets, and alert you to offline assets, all supported by integrated notifications. You can easily import, export, script, schedule, integrate, merge, and synchronize your asset inventory with current systems. Rumble operates swiftly and uncovers assets without requiring special access or credentials. With just one agent, an entire enterprise can be assessed, or multiple agents can be deployed to minimize cross-site traffic. Discovering networks of any size can be accomplished in a fraction of the time compared to traditional tools, making it a more efficient choice for asset management. Furthermore, this streamlined process allows for greater flexibility and responsiveness in addressing network security needs.

Cisco ThousandEyes is an innovative platform for network intelligence that equips organizations with profound insights into digital interactions across various environments, including the internet, cloud, and enterprise networks. Utilizing sophisticated monitoring and analytics capabilities, ThousandEyes enables businesses to identify, troubleshoot, and rectify performance challenges that affect essential applications, websites, and services. Its extensive array of tools delivers valuable information regarding network performance, application delivery, and user engagement, allowing organizations to maintain uninterrupted connectivity and enhance user experiences. This platform is widely embraced by Fortune 500 companies and SaaS providers alike, establishing itself as a reliable solution for navigating the intricacies of contemporary hybrid and multi-cloud landscapes. Additionally, ThousandEyes empowers IT teams by equipping them with the tools needed to proactively manage, optimize, and refine their digital infrastructures for improved operational efficiency.

Icinga is an internet monitoring system that checks the availability of your network resources and notifies users when there are outages. It also generates performance data for reporting. Icinga is flexible and extensible. It can monitor complex environments in multiple locations. Icinga 2 is the monitoring server and requires Icinga Web 2 on top in your Icinga Stack. You can manage the configuration with the Icinga Director or config management tools. Plain text is also available within the Icinga DSL. Find solutions, take action and become a problem-solver. Flexibility is key. Keep curious, stay passionate, and stay in the loop. Tackle your monitoring challenge. The Icinga stack consists of six core strengths that cover all aspects related to monitoring. You can get valuable insights, on-time notifications and eye-opening visuals as well as analytics. Icinga integrates easily into your systems and gives you the power of automating your tasks.